The variable word is the name to be encoded. The variable
maxCodeLen is the limit on how long the returned name code
should be. The default is 4.
The onca algorithm is only defined for inputs over the
standard English alphabet, i.e., "A-Z.". Non-alphabetical
characters are removed from the string in a locale-dependent fashion.
This strips spaces, hyphens, and numbers. Other letters, such as
"<U+00DC>," may be permissible in the current locale but are unknown to
onca. For inputs outside of its known range, the output is
undefined and NA is returned and a warning this thrown.
If clean is FALSE, onca attempts to process the
strings. The default is TRUE.