Signal flags/"naval flags"

BUR #43490 is pending approval.

create alias naval_flag -> signal_flag

Duplicate tag, "signal flag" is the correct name and has three times the post count attached to it.

BUR #43491 is pending approval.

create alias signal_flag -> naval_flag

Alternate BUR for voting purposes. Given that "signal flag" has three times the posts of "naval flag" despite being created two years later, most people seem to know them (correctly) as signal flags.