Final answer:
The figures next to an obstacle on a sectional chart refer to the obstacle's absolute height AMSL and relative height AGL, aiding pilots in maintaining a safe altitude.
Step-by-step explanation:
The numbers next to an obstacle on a sectional chart in aviation, such as 1375 and (349) beneath it, represent two separate altitudes. The larger number 1375 is the height of the obstacle in feet above mean sea level (AMSL), while the number in parentheses, (349), is the height of the obstacle in feet above ground level (AGL). This information is crucial for pilots to ensure safe navigation by maintaining sufficient altitude to clear obstructions.