What does WT mean

In the last few months, I have noticed a few incidences of people writing WT after a tyre description, such as "Schwalbe 27.5 2.4 WT" (I made that one up).
Will someone kindly tell me what the WT means please?
The best I can think of is Wide Tyre, but that seems superfluous.
Will someone kindly tell me what the WT means please?

The best I can think of is Wide Tyre, but that seems superfluous.
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Some tyres are larger than other makes etc.
Bird Aeris 120 | Boardman Team 650b | Boardman Pro FS | Calibre Two.two
Yeah, I get that, but to run a 2.6 you'd need a 'wider' rim anyway, no? When I need a new one I'll go for a 2.5 WT and see if I notice any difference.
Bird Aeris 120 | Boardman Team 650b | Boardman Pro FS | Calibre Two.two
Running my 2.6 on a 30mm. If I'm reading the DT Swiss PDF right, I can run up to a 3.5 on it! :shock:
Bird Aeris 120 | Boardman Team 650b | Boardman Pro FS | Calibre Two.two