I'm browsing through an old book "Basic Computer Simulation" from 1983. It contains a line of BASIC code that reads:
LET Z1 = M * D1 * (PQ / A) [ 3
I understand all of the code except the "[ 3" I don't ever remember that syntax in any BASIC I learned.
The book calls it a "universal subset of BASIC" and says it has been tested on a TRS-80 Model III. Similar lines of code appear in other listings in the book so I don't think it is just a typesetting error.
Another formula in a different listing is:
LET H = H1 - .5 * G * (T1 - T) [ 2
This is a formula for a falling object.