Kanji: 千 sen 1000
It looks like a 10 [ 十 ] with a slanted line over it. Think of the line as adding two extra 0's: 1000
JLPT N5: 12 / 100 | 3 Strokes
1) top (almost) horizontal line; 2) second horizontal line; 3) the vertical line from top to bottom.
千円 sen en - 1000 yen [the 一 ichi becomes "iss" perhaps because it is easier to say than "ichisen." Also yen is pronounced "en"]
三千二百 san zen ni hyaku - 3,200
二千年 ni sen nen - the year 2000
kore wa gosen en hodo de kaemasu.
This can be bought for about 5,000 yen.
[hodo shows the "about" uncertainty.]