What are some interesting types of writing other than 1337 and Polish 'Pokemon writing'. Here's the alphabet of the latter:

A - "4," "@," "/," "/-," "F|,"
? - "om", "a", rarely "4,", "@,", "/,", "/-,", "F|,"
B - "8", "|3", "|8"
C - "©", "<", "[", "(", less often "{"
? - "c'", "©'", "<'", "['", "('", "{'", "t?", "ts'", "*|*5'", "^|^5'", "*|*s'", "^|^s'", "t5'"
D - "|)", "])", "[)", "o|"
E - "3", "€", "(="
Ê - "E,", "em", "3,", "€,"
F - "|="
G - "G," "6," "(-"
H - "|-|", "[}{]", "#", "ff"
I - "l", "1", "!", "|", or as a conjunction: "&" (there are several versions of this letter)
J - "_|", "Y", "`)"
K - "Q" "C", "|<", "|{" "]{", "|c", "ck", "(|<", "<|<", "{|<", "[|<", "©|<", "c|<"
L - "1" (please do not confuse with "1" meaning "I" or with 1 meaning !), "|_", "] [_"
L - usually not present, but in some variations: "|/_", "ó" or "w"
M - "||", "/|", "^^", "nn", "rn"
N - "|\|", "/\/"
Ñ - occurs extremely rarely as "||" or "/ /"
O - "0" (in words: zero), "()", "([])"
Ó - not present, or if present, misused or replaced by "oo" or "(')"
P - "[]D", "|D", "|>", "|O"
R - "®", "|2", "12"
S - "5", "$", "§"
¶ - "$", "s'", "5'", "§'"
T - "7", "'] ['", "^|^", "+"
U - "OO", "|_|"
V - "\/"
W - "\/", "VV", "|/|", "f", "ff", ? (native to the Wiadomo?ci)
X - "X", "><", "}{", ")("
Y - "Y", "/" "'/"
Z - "2", "7_"
Z - "sh", "2*", "7*_", "z*"
? - "2'", "7'_", "z'"
! - "1", "i" , "uan" , "oneone", "one"