There are no element abbreviations in TPT with the letter "J" in them, just like in the periodic table.

J: like LOLZ and LOVE but is shaped like a "J". It is also a moving solid, but its velocity is set to 0 every frame

JRAY: Randomly acts like either ARAY, BRAY, CRAY, DRAY, or FRAY.

PWRJ: Powered J; turns on when powered.

BRKJ: Breakable J; breaks when broken.

PBJ: Peanut Butter and Jelly Sandwich. not powered breakable J, of course.

BKNJ: Broken J

JICE: J ice. Not related to SLDJ.

JSNS: J Sensor. Creates a spark when a J is nearby, including "J"s on signs

SLDJ: Solid J, Liquid form of J

LQDJ: Liquid J, Solid form of J

GASJ: Gas from of J. fuses at absolute 0 with strong gravity, but only when water equilization is on.

SPWNJ: Spawns JBOTs

JSCN: J-type silicon. Turns powered materials on, then off when its life reaches 0.

JBMB: J bomb http://danball.wikia.com/wiki/Jointbomb

JCB2: potato

JUMP: causes STKM, STK2, JBOT, and HJCK to jump when nearby, with a range set by tmp2.

JELY: Jelly. created PBJ when combined with PBTR and BRED. Also very sticky like GEL, but 1000 times more

JLIF: J life. B9-1Si0

J WALL: Blocks all elements that don't have a J in their name.

There are also no elements with 0, 1, 6, 7, 8, or 9 in the name:

016789: Does nothing (has a long name like SPWN2)

C-0: explosive that never explodes

C-6: Explodes at temperatures below 0K

C-7: Explodes when its pressure is low

C-8: Explodes under high pressure

C-9: Always explodes instantly

STK0,6,7,8,9

controlled by TFGH, IJKL,numberpad /789, numberpad 5123, and 0OP[

There are also no elements with the symbols `~!@#$%^&*()_+{}|:"<>?,./;'[]\= in them, or any control characters.

I made a graph of saves with only "J"s in the name (or a tag that is just "J"s)

I will continue to add more

If you can make HJCK able to tell if something is an airplane, then that would be more impressive than making moving solids.

Even detecting "chair-like objects" would be pretty hard.

maybe we need a new element, called [SEAT]