(linear algebra) triangular matrix

(linear algebra) lower triangular matrix

(Internet slang) I just got here, so please tell me in three lines what happened.

Alternative form of 北

high / far

lofty

The left "step" radical, called 行人偏 (gyōninben)

equestrianism, horseriding / a coachman / (by extension) serving nearby (to an aristocrat, etc.)

prefixed to make an honorific kanji compound, especially used to indicate that the [word] belongs or is related to the emperor and/or the equivalents

suffixed to make an honorific kanji compound which means the action belongs or is related to the emperor and/or the equivalents