noun
number of lines; line count
Used for counting lines of text, code, or rows in a table. 行数 is a straightforward compound of 行 (line/row) and 数 (number).
このレポートの行数は全部で50行です。
The total number of lines in this report is 50.
行数が多すぎて、印刷すると紙を無駄にしてしまう。
There are too many lines, so printing it would waste paper.