The number of entries allowed on your Schengen visa can be checked from the label entitled –
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NUMBER OF ENTRIES
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NOMBRE D’ETNREES
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ANZAHL DER EINREISEN
Here, a ‘MULT’ label stands for multiple entries. Similarly, a ‘1’ label denotes single entry, and a ‘2’ label is for double entry.
Single-entry visa
As illustrated in the visa sticker attached to their passport, a single-entry visa allows its holder to enter the Schengen Region only once, within a given period of time. If the visa holder has left the Schengen zone, he or she will no longer be allowed to return, even though the number of days permitted by the embassy issuing the visa has not been spent there.
Double entry visa
A double-entry visa usually applies in the same manner as a single-entry visa. The only difference between a single-entry visa and a double-entry visa is that the second one gives you the option to return after you have left the Schengen area again.
You should be very careful not to exceed the number of days allowed to remain in the Schengen Zone, as well as the time during which you are allowed to stay in the Schengen Zone