What do the numbers mean after the # in people's names on bitchat?

ie

@ anon # 7a1c

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My guess is it's a hash for that device or user. I don't know if they stay the same every time you connect or not.

Many are not valid geohash as they include "a" I tried randomly searching some. Maybe a hash per log in. I can't see mine as it doesn't seem to publish one for yourself.

Pretty sure is their geohash (location)

Some of the numbers don't work on https://geohash.softeng.co/9d

I dig that website.

Pretty wild