Bis is a Latin prefix or suffix designating the second instance of a thing, thus preceding ter. An example in recent modern usage is the ITU-T modem standard from the late 20th century, V.32bis. Bis can also refer to:
Pachelbel's Canon in D major, a piece of chamber music scored for three violins and basso continuo and originally paired with a gigue in the same key, experienced a tremendous surge in popularity during the 1970s.
Number 1. In determining a key signature for any named major key, it's important to know whether the key signature has sharps or flats. With the exception of the key of C major (no sharps or flats) and F major (one flat), any stand-alone letter is going to be a major key with sharps: G, D, A, E, B, F#, C#. Of course if a sharp follows the letter name (F#, C#), the key signature will have sharps.