Ayuda de LibreOffice 26.2
Look for criterion in an already-sorted array, and return a corresponding result. Returns the contents of a cell either from a one-row or one-column range.
Optionally, the assigned value (of the same index) is returned in a different column and row. As opposed to VLOOKUP and HLOOKUP, search and result vector may be at different positions; they do not have to be adjacent.
LOOKUP(Lookup; SearchVector [; ResultVector])
Lookup is the value of any type to be looked for; entered either directly or as a reference.
SearchVector is an array of data. The lookup is performed in the first row or first column of the array.
The search vector for the LOOKUP must be sorted ascending, otherwise the search will not return any usable results. Numerical values precede values of type Text if both types are included (for example, -2, 0, 2, “A”, “B”).
If SearchVector has same number of columns and rows or has more rows than columns, LOOKUP searches in the first column (similar to VLOOKUP), and returns the corresponding value in the last column.
If SearchVector has more columns than rows, LOOKUP searches in the first row (similar to HLOOKUP), and returns the corresponding value in the last row.
VectordeResultado ye otra área d'una columna o una filera dende la que se toma la resultancia de la función. La resultancia ye la caxella del vector de resultancia col mesmu índiz que la instancia que s'atopó col vector de busca.
If ResultVector is omitted, the function returns the value found in the last row or last column of the SearchVector array.
If SearchVector is a one-dimensional array and if ResultVector is omitted, the function returns the last occurrence of the lookup value if it exists in the SearchVector.
La tabla siguiente amuesa los códigos internacionales de dellos países.
Source: https://www.countrycode.org

=LOOKUP(46;A2:B34) returns "Sweden", the country which code is 46. Since the result vector is not defined, the function returns the value in the last column of the search array.
=LOOKUP(55;A2:A34,D2:D34) returns "BR/BRA", the ISO code for country code 55 (Brazil).
=LOOKUP(7;A2:B34) returns "Russia", the last occurrence of country code 7 in the search array.