Count Unique Values Regardless of Capitalization – Google Sheets
Count unique values in a spreadsheet while ignoring capitalization.
count
COUNTUNIQUE Function – Google Sheets
Counts the number of unique values in a data set.
Count With OR Logic in Google Sheets
Count cells based on several conditions
Count Rows With OR Condition in Two Columns- Google Sheets
Count cells based on values in two columns
Count Cells Without Certain Text Anywhere in the Cell
Count cells that do not match a condition