Which preposition to use with beta

for Occurrences 1%

His second Book was inscribed Beta for the same Reason.

in Occurrences 1%

F.R.G. AUCTOR.We quite agree with our Correspondent that such contributions as that of BETA in No. 5, entitled "Prison Discipline and Execution of Justice," illustrate the manners and customs of the olden times far better than a whole volume of dissertations; and we gladly adopt his suggestion of inviting similar communications.

Which preposition to use with  beta