Eight
numeral
When a vocab is a single kanji it usually steals its meaning from its kanji as well. Same goes for this vocab word. It means eight.
はち
When a vocab is a single kanji and all alone like this, it's usually going to use the kun'yomi. But, because this is a number (exception) it uses the on'yomi instead, meaning you already know the reading from when you learned the kanji!
これは八ページのエッセイです。
This is an eight-page essay.
トイレットペーパーが八ロールしかない。
There are only eight rolls of toilet paper.
パパは八トントラックのドライバーなんです。
Dad is an eight-ton truck driver.