Conditional Formatting, Text and Suppression Indicators and Tooltips

When a conditional format, text, or suppression applies to a cell, row, or column, a grey triangle is displayed in the upper right corner of the row or column header or the cell.
Screenshot shows a grid row with a conditional indicator at the row level on row 1 and at the cell level on cell C1.

When you hover your mouse over the indicator, a tooltip displays the list of conditional formats, text, or suppressions that apply to that cell, row, or column.
Screenshot shows a mouse hovering over a cell indicator that displays three conditional formats: Green, Yellow, and Red.