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identifying

An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique class of objects, where the "object" or class may be an idea, physical [countable] object (or class thereof), or physical [noncountable] substance (or class thereof). The abbreviation ID often refers to identity, identification (the process of identifying), or an identifier (that is, an instance of identification). An identifier may be a word, number, letter, symbol, or any combination of those.
The words, numbers, letters, or symbols may follow an encoding system (wherein letters, digits, words, or symbols stand for (represent) ideas or longer names) or they may simply be arbitrary. When an identifier follows an encoding system, it is often referred to as a code or ID code. Identifiers that do not follow any encoding scheme are often said to be arbitrary IDs; they are arbitrarily assigned and have no greater meaning. (Sometimes identifiers are called "codes" even when they are actually arbitrary, whether because the speaker believes that they have deeper meaning or simply because he is speaking casually and imprecisely.)
ID codes inherently carry metadata along with them. (For example, when you know that the food package in front of you has the identifier "2011-09-25T15:42Z-MFR5-P02-243-45", you not only have that data, you also have the metadata that tells you that it was packaged on September 25, 2011, at 3:42pm UTC, manufactured by Licensed Vendor Number 5, at the Peoria, IL, USA plant, in Building 2, and was the 243rd package off the line in that shift, and was inspected by Inspector Number 45.) Arbitrary identifiers carry no metadata. (For example, if your food package just says 100054678214, its ID may not tell you anything except identity—no date, manufacturer name, production sequence rank, or inspector number.)
In some cases, even arbitrary identifiers such as sequential serial numbers leak too much information (see German tank problem). Opaque identifiers—identifiers designed to avoid leaking even that small amount of information—include "really opaque pointers" and Version 4 UUIDs.
The unique identifier (UID) is an identifier that refers to only one instance—only one particular object in the universe. A part number is an identifier, but it is not a unique identifier—for that, a serial number is needed, to identify each instance of the part design. Thus the identifier "Model T" identifies the class (model) of automobiles that Ford's Model T comprises; whereas the unique identifier "Model T Serial Number 159,862" identifies one specific member of that class—that is, one particular Model T car, owned by one specific person.
The concepts of name and identifier are denotatively equal, and the terms are thus denotatively synonymous; but they are not always connotatively synonymous, because code names and ID numbers are often connotatively distinguished from names in the sense of traditional natural language naming. For example, both "Jamie Zawinski" and "Netscape employee number 20" are identifiers for the same specific human being; but normal English-language connotation may consider "Jamie Zawinski" a "name" and not an "identifier", whereas it considers "Netscape employee number 20" an "identifier" but not a "name". This is an emic indistinction rather than an etic one.

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  1. R

    help identifying this bath/shower mixer

    Hello, this is my first post on here. i am trying to stop water weeping from the temperature control side handle of this tap. I am going to replace the o rings but can't see any markings on the taps to identify them. i contacted grohe because i thought it looked like a sentosa but grohe say...
  2. Simon42

    Help identifying tap valve

    I have a dripping valve on my towel rail, but when I removed the cartridge it doesn't seem to be the standard one, and I don't know how to find a replacement. I'll attach a photo. Any help welcome.
  3. S

    Identifying a sink please

    Evening everyone, was hoping for some help identifying my in-laws bathroom sink, to see if anyone has ever came across it before. They’re thinking about getting a new one so looking for anything on how to take it apart without smashing it. Father inlaw mentioned it had really big springs in...
  4. chucka

    identifying and replacing a radiator

    Hi all.. First post is usually somebody needing something.. apologies this is the same. Hopefully I can help someone on here with computer technology. I am quite handy around most things and am not frightened to even to some soldering if I have to. But a straight swap is going to be less...
  5. D

    Help identifying cistern

    Hi all, I recently had new cisterns installed by a builder, who unfortunately turned out to be a cowboy; and has since been kicked off-site. He told us that he’d fitted Geberit; but, I’ve now been informed that they’re most likely a generic Polish model. Anyway, no one seems to be able to...
  6. P

    Help identifying this compression fitting please

    Hi, can anybody tell me who makes these 22mm plastic to copper tees? They're installed all over my CH system (house built 2007) and this is the 2nd one to have leaked in last 12 months. After cutting off the first one that leaked and replacing it with a SpeedFit I worked out I simply needed to...
  7. J

    Help identifying broken "ceramic" part found in toilet bend

    Hi all, Hoping for some help to identify this - images attached - I found this in the bowl of my wall mounted toilet in the upstairs bathroom geberit parts but installed by previous home owner The toilet works and there’s no obvious external leak or smell I’ve got 2 kids so not impossible...
  8. Stefromthewirral

    Can anyone help in identifying this concealed thermostatic shower valve?

    Hi, I've been passed on a job by someone today to replace the cartridge on this concealed thermostatic mixer valve, problem is the owner has said it's been in for over 10 years and I don't recognise the make :( It looks like a Mira but if it is I still dont have any idea what model! Any help...
  9. A

    Going to install a Magnetic filter some help needed identifying pipes

    Hi, new member but would appreciate any help, I am a DIYer but generally consider myself competent enough to do basic plumbing so am going to put in a Magnaclean Professional 2. I want to ensure I put it on the return as I am also going to be borrowing a Magnacleanse for an initial deep clean...
  10. Rob Foster

    Help identifying this water meter please

    We have come across this water meter but can not identify producer
  11. hary_j

    Help with identifying gas fire Make

    Evening guys, Can anyone help with the Make & Model of the gas fire shown? Excuse the blacked out image. Thanks
  12. S

    Help identifying syphon please!

    Hi Can anyone help me with identifying this syphon, there are no markings or make etc on it, Ive took it to 2 separate merchants and had no luck, thank you in advance
  13. T

    Identifying shower waster. Anyone?

    Could anybody please provide some idea as to the manufacturers of this shower waste would be, please? It is wider than usual: OD of the washer is 110mm (ID is 85mm). Thanks for any help.
  14. C

    Help Identifying Valve

    Hi, Could you tell me if this is an isolating valve(I presume it is) but is it a drain also for the expansion vessel? IMG 0986
  15. B

    Help identifying parts

    My daughter has moved into a house and we are trying to get to grips with the heating system. Can anyone please tell us what the thing in the attached phots is and what it does. Many thanks.
  16. H

    Help identifying a pipe please

    Hi everyone I’m looking for a little help to identify a pipe so far I think the below is correct (see pic) A - hot from boiler B - expansion to expansion tankin loft C - control for hot water tank D - control for central heating E - return from hot water tank coil, return from central...
  17. J

    Identifying where my condense pipe goes into

    Hi all, I posted a thread the other day about my condense pipe being blocked and someone that was sent by the management company telling me that my condense pipe shouldn't feed into a waste pipe (Gas safe registered plumber may have fitted boiler against terms of the lease). The overwhelming...
  18. W

    Help identifying component on gas supply pipe

    I have been surveying an empty house for an insurance company. The gas supply was isolated at a quarter turn ball valve upstream of the meter, but there was also a component upstream of that valve that I didn't recognise. Attached to it was a Southern Gas Networks label that had a tick at the...
  19. M

    Help please identifying shower

    Can anyone identify my concealed shower please? It is dripping and I want to replace the cartridge/valve rather than the whole unit. Thanks.
  20. J

    Help identifying toilet!!

    Hello, Looking for help identifying a toilet in a house we moved in to around 4 months ago. The toilet seat needs replacing and I'm struggling to find a like for like replacement but also we need to replace the toilet downstairs and I would like to match them! Also please advise on the flushing...

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