The kanji 差 primarily conveys the concept of "difference," "discrepancy," "variation," or "to differentiate." It signifies a gap or distinction between things, whether in terms of size, quality, amount, or any other measurable attribute. It can also imply the act of setting something aside or subtracting.

・On-yomi (音読み): サ (sa) ・Kun-yomi (訓読み): さ(す) (sa(su))

⚫︎ 差（さ）がある Translation: There is a difference; there is a discrepancy. ⚫︎ 差（さ）し引（ひ）き Translation: Deduction; subtraction. ⚫︎ 時（とき）差（さ） Translation: Time difference; time lag.

The kanji 差 is a 形声文字 (keisei moji), which means a phono-semantic compound character. The left side is 羊 (yō), meaning "sheep." The right side is 刀 (tō), meaning "knife." The original meaning might have related to the difference in size or shape, like cutting or distinguishing between things with a knife to create a "difference". The "羊" part provides the semantic element, hinting at a connection to measuring or comparing with sheep, possibly using them as a reference point. The "刀" portion provides a sound element as well. The character's evolution has led it to its current meaning of "difference."