APL
Software / App
An array-oriented programming language, originating from Ken Iverson's mathematical notation for 'notation as a tool for thought' in the late 1950s/early 1960s.
Mentioned in 3 videos
Videos Mentioning APL

Jeremy Howard: fast.ai Deep Learning Courses and Research | Lex Fridman Podcast #35
Lex Fridman
An array-oriented programming language, originating from Ken Iverson's mathematical notation for 'notation as a tool for thought' in the late 1950s/early 1960s.

Travis Oliphant: NumPy, SciPy, Anaconda, Python & Scientific Programming | Lex Fridman Podcast #224
Lex Fridman
A predecessor of array-based programming from the 1960s, which offered unique glyphs and concepts like adverbs to think in N-dimensions, influencing later array libraries like NumPy.

Brendan Eich: JavaScript, Firefox, Mozilla, and Brave | Lex Fridman Podcast #160
Lex Fridman
A family of languages (J, K) useful for linear algebra, relevant to machine learning kernels.