.db (also .byte and .text) and .dw (also .word)

.db expression [, expression [, expression [, ...]]]

Defines bytes (.db, .byte, .text) or words (.dw, .word).

You can specify a comma-delimited list of expressions. Unlike most places expressions are used, you can include strings. Here are a few examples:

.db 1, 2, 3, 4
.dw $CAFE, $BABE
.db "This is a string", '!', $20, "Here's a \"capital\" E: ", 'e'+('A'-'a'), 0