Source: https://shop.boingboing.net.Jackhammer Jill t-shirt in Boing Boing shop. License: All Rights Reserved.

Jackhammer Jill is a mascot for internet magazine04b_19, a bitmap font by Yuji Oshimoto. Jill is also a font:FF Peecol, a set of mix-and-match character-building dingbats released in 1998 by FontFont and drawn by pixelmasters Steffen Sauerteig, Kai Vermehr, and Svend Smital of eBoy. (In 2007, eBoy redesigned the mark with new lettering, but it was dropped two years later.)

Jill was created by mixing a pig-tailed girl glyph for the top half and a construction worker glyph for the bottom.

Source: https://shop.boingboing.net.Animated logo introduced in 2003. (Click to see in motion). License: All Rights Reserved.

Source: http://boingboing.net.LEGO Jackhammer Jill by Rob vanBrandenburg. License: All Rights Reserved.

Source: https://web.archive.org.2007 logo by eBoy. (Enlarged to show texture). License: All Rights Reserved.

Source: https://web.archive.org.1999 logo by Mark Frauenfelder. (Enlarged to show texture). License: All Rights Reserved.