Strongs Number: G0
The original word in the Greek or Hebrew is translated by more than one word in the English. The English translation is separated by one or more other words from the original. e.g. Mt. 15:30 Strong's No. 630
English to send away
send G630 her G846 away G630
Here the verb "send away" is split by the word "her". The zero means the verb only occurs once in this passage not twice. Sometimes five or six words separate a word. Some exceptions are in Jer. 51:3 where the zero in "bendeth H1869 H0 let the archer H1869 H8802 bend H1869 H8799 " connects "bendeth" with "bend" not "archer".
See also Nu:16:13, 22:17, 2Sa 12:14