Only bats and t***s fly in the dark! Sorry, a crewman adage from yore. CG
True, in a certain job, in a certain northern province, where I did nothing but night flying for months on end the abbreviation in the centre on my RAF wings was subtly altered to say "BAT".
And before CG jumps straight back in with the usual banter, no, there wasn't enough room for the other, longer word....
The rumour that I also used to sleep upside down in the wardrobe, was slightly exaggerated.