In rueda, pelota uno is an enchufla with a clap on 7. Pelota dos is enchufla with two claps (on 7-8), and pelota tres with three claps (7-8-1).
In ábaco it is similar, but the last clap is always a ¡bulla! (a shout) with the arms lifted up. So in pelota uno in ábaco there is no clap, it is enchufla with ¡bulla! on 7. In pelota dos there is one clap (on 7) and one ¡bulla! (8), and in pelota tres there are two claps (on 7-8) and one ¡bulla! (on 1).
Cuban rueda with partner change using two claps and ¡bulla!