אָת֙וֹהִי֙ כְּמָ֣ה רַבְרְבִ֔ין וְתִמְה֖וֹהִי כְּמָ֣ה תַקִּיפִ֑ין מַלְכוּתֵהּ֙ מַלְכ֣וּת עָלַ֔ם וְשָׁלְטָנֵ֖הּ עִם־דָּ֥ר וְדָֽר׃
Ibn Ezra
[Daniel 3:33] His signs (אָתוֹהִי - Atohi)... great (רַבְרְבִין - ravrevin): [Means] great/large (gedolim). And this doubling [of the root letters ר-ב in ravrevin for emphasis] is like [the formation of the Hebrew word] galgal (גַּלְגַּל - wheel/whirlwind) [which is also formed by reduplication of the root ג-ל].