One variation used a short vertical bar instead of the dot.

However, variations using some form of active current source or load, not considered a gain stage, are used.

Another variation uses more than one diver along the search line.

The second is a far more abstract variation using only brass instruments.

Another variation uses a red and a blue deck of 36 custom playing cards each.

I've made dozens of variations using whatever's in season.

The most common variation uses words of four letters instead of five.

Newer variations use a simple scale to help you monitor your appetite.

Another variation is using five dice instead of six.

Yet another variation in Japan uses name of pieces from shogi.