Vessels built are given first; vessels building, if any, are added after a plus sign.
The plus sign always represents something positive; the minus, something negative.
The dagger symbol was used in the keys; I changed them to the plus sign.
Hydrogen's one plus, if that double-hook dingus is a plus sign; Helium's four-plus, that's right.
The multiplication sign (×) was obtained by changing the plus sign into the letter X.
In column 10 where the dates are given, a minus sign indicates the past and a plus sign the future.
The plus sign indicates that the direction of the current is from you.