@Override
			public void mouseMoved(MouseEvent e) {
				if (!isHelpEnabled()) {
					return;
				}

				restoreCursor();
				int columnIndex = columnAtPoint(e.getPoint());
				if (columnIndex < 0) {
					return;
				}

				hoveredColumnIndex = columnIndex;
				isOverHelpIcon = isMouseOverHelpIcon(e.getPoint(), columnIndex);
				if (isOverHelpIcon) {
					installCursor();
				}

				repaint();
			}
This is the cursor used by BasicTableHeaderUI to tell the user they can resize a column
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTableHeader.java