The numbers that indicate the depth of the water, some times they are in parenthesis like it will say 5, then right next to it (7) or something like that.
Sometimes when data are presented in charts and graphs numbers in parenthesis will indicate the number of measurements taken (in this instance the number of soundings taken to derive the avg. depth). But I'm only guessing as far as a nautical chart goes.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn.
the legend on the chart will describe ever detail. check there for the specifics for your chart. Usually for lights and or other extra detail are in parenthesis that might tell you their flash codes.... ie: Fl (1+4+3) for Minots...with other info such as the height and how far it can be seen...not usually in parenthises...
as well as the aforementoned warnings for rocks and such...
but definately check out the legend on the chart you are referring to...
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