Where does “מפא״י” come from?

מפא״י (Hebrew) comes from Hebrew מִפְלֶגֶת פּוֹעֲלֵי אֶרֶץ יִשְׂרָאֵל — Workers' Party of the Land of Israel.

Ancestry of “מפא״י”, step by step

Step	Language	Word	Meaning
1	Hebrew	מִפְלֶגֶת פּוֹעֲלֵי אֶרֶץ יִשְׂרָאֵל	Workers' Party of the Land of Israel

מפא״י — Etymology, Origin & Word History | Etymology Explorer