lda #$00
	ldx #$00
loop	sta $c000,x
	inx
	bne loop
	rts


Uses `loop` as a jump/branch address.

	ldx 1
	lda dat
	sta dat,x	
	rts
;
dat	byte 0,0


Or
dat 	word 0


Or
dat	text "abc"	


Uses `dat` as a load,save address in memory.


You can load from,save to,jump/branch to,or use in an expression any label name.