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A testator can sign with his thumbmark (Solar v. Diancin, 55 Phil. 479; De Gala v. Gonzales, 51 Phil.
480) or with his initials (Yap Tua v. Yap Ka Kuan, 27 Phil. 579), or even with a rubber stamp or an
engraved dye, provided he intends the same to be his signature. (Thompson on Wills, Sec. 108, pp.
171-173). Even if the testator’s hand is guided by another when the signing or marking is made, the
signing will still be valid, and will be considered as having been done by the testator himself. (Amata v.
Tablejo, 48 Phil. 485). - Civil Code of the Philippines, by E. Paras