per pale
adverb
- in heraldry, signifies divided into two parts by a line down the middle
Wiktionary
adv
- (Partitioned) vertically; (especially) partitioned vertically into two halves (formally party per pale).
“per pale gules and argent; tierced per pale; an escutcheon tierced per pale and per chevron”
“Alexander Wemyss of Lathocar, however, in 1511 bears, per pale, dexter a lion rampant for Wemyss, and sinister a saltire. The saltire is probably his wife's arms.”