One must not give up one's efforts, even those that are in vain

plural of EIB

(aviation) An aerobatic maneuver following a path that resembles the figure 8 on its side.

plural of eighth grader

(US, education) A pupil who is in eighth grade.

Synonym of free, white, and twenty-one

(computing) exbibyte (2¹⁰ (1024) pebibytes or 2⁶⁰ (1024⁶) bytes).

(computing) exbibit (1024 pebibits, or 2⁶⁰ (1024⁶) bits).

Alternative form of either-or

plural of Eichel