तैत्तिरीय आरण्यक (सायण भाष्य एवं भट्टभास्कर भाष्य सहित सम्पूर्ण प्रथम भाग)

? No, it looks like ढ with a dot under it?
Wait, look at the scan:
Under the letter between त and र्थ:
There is a horizontal stroke, then two dots below!
Wait, could it be तद्गूढार्थवचनमपि?
Let's search Anandashrama Taittiriya Aranyaka volume 2:
Mantra 78 (or 77):
Wait, volume 2 of Anandashrama Sanskrit Series 36 (Taittiriya Aranyaka with Sayana Bhashya):
Page 891!
Let's check the text of page 891 in ASS 36:
"बोध्यं तद्गूढार्थवचनमपि बाधरहितमिति" - wait, is it तद्गूढार्थ or तद् यथार्थ?
Wait, "तद् यथार्थवचनमपि" is the standard phrase in Sayana Bhashya!
Wait, why would it be "तद्गूढार्थ"?
Wait, look at the glyphs:
Is that यथा?
If a printer set गूढ by mistake for यथा, the editor put dots under गूढ to mark it as doubtful/erroneous!
Yes! In Anandashrama editions, dots under characters (त्रुटिचिह्न / संशयचिह्न) indicate doubtful readings in the manuscript!
The letters printed are indeed: `तद्गूढार्थवचनम