last is a Jinja filter that can be used to return the last element in a list. Take for example the following.

{% set fruits=['banana','apples','pineapples', 'grapes'] %}

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Original List: 
{{ fruits }}

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Last Element in List:
{{ fruits | last }}

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Last Element in Sorted List: 
{{ fruits | sort | last }}

Something like this should be returned.

Original List: ['banana', 'apples', 'pineapples', 'grapes']

Last Element in List: grapes

Last Element in Sorted List: pineapples