Nu ephelkustikon. (ν-ἐφελκυστικόν)

Some forms of nouns or verbs add a ν, when the next word begins with a vowel or when there is no next word (i.e. when a punctuation mark, even a comma, follows).

This occurs in
a) Dative plural forms ending in
-σι
b) A pa/pr-ind 3rd sg in -
ε
c) A 3rd sg/pl forms in
-σι
d)
ἐστι

In this grammar the ν-ἐφελκυστικόν, as this phenomenon is called, is shown in the paradigms as a lesser-sized final ν: -σιν, -εν. Where the letter is too small for further downscaling a faint grey ν  is used instead:  ν. The author quite realizes  it takes an eagle eye to discern this, but Greek grammar requires such an eye anyway.

In Epic the n-ephelkustikon frequently occurs when the next word begins with a consonant, and thereby becomes a means for making long syllables.