The Ultimate-Guitar.com (UG) version of the pound sign (£) - it is common amongst hard-core patriotic users to use this replacement (J) outside of context and UG...

J or j can be used - both are acceptable.

This replacement of 'J' and '£' arises from the personal messaging system. It inexplicably replaces '£' with 'J' before sending, presumably because it cannot store or send '£' as it is not a letter, and as UG is American, the £ is unlikely to be used.
- Oh that's about J180 isnt it?
- cheapest I've seen is J500!
by STROPH March 17, 2009
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A short, cool way for Jews to say JCC
Leo: yo Jake, wanna hit up the J before shabbus?

Jake: yeah sure bro, I’ve been working on my Lay-ups all week. But I gotta be home before 6 cuz my cousins are coming over.
by 809 April 29, 2019
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he stepped on my j's !

Nelly ft JD ft Ciara - Stepped On My J’Z
by Michantely July 10, 2008
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