noun
Used as a katakana version of 'left', often in labels, instructions, imported terminology, or contrast with ライト. For ordinary everyday direction, 左 is usually more natural.
See also: ライト
画面の「レフト」を選ぶと、画像が左に移動する。
Selecting “Left” on the screen moves the image to the left.
noun
Baseball term. レフト can mean the left-field position/area, or the player defending that position.
彼は高校時代、レフトを守っていた。
In high school, he played left field.
今日のレフトは肩が強い。
Today's left fielder has a strong arm.