(computing) character whose appearance may depend on a user's environment, or a character which may be absent from a user's environment, i.e. character set incompatibility

sense of loneliness

cathode ray tube, CRT

(electronics) triode (vacuum tube)

(electronics) tetrode (vacuum tube)

(aviation) control stick

the form of the 爪 radical when it appears in the crown position (⺤) as in 爰

firecracker (powder wrapped up in paper as a toy for children) / a fit of anger

hairsbreadth, close call

paper bag