vocalic_sign combinations
IAST rṛ rṝ rḷ rḹ lṛ lṝ
Velthuis r.r r.R r.l r.L l.r l.R
expanded र ृ र ॄ र ॢ र ॣ ल ृ ल ॄ
Unicode रृ रॄ रॢ रॣ लृ लॄ
Velthuis.r.rr .l.ll
IAST
MWṛiṛīlṛilṛī
UnicodeU090BU0960U090CU0961
Unicode
ra + virama + vocalic
र ् ऋर ् ॠर ् ऌर ् ॡ
र्ऋर्ॠर्ऌर्ॡ
IASTklṛkḷ
Velthuiskl.rk.l
expandedक ् ल ृक ॢ
Unicodeक्लृकॢ
IASTlṛ
Velthuisl.r-
expandedल + ृ
Unicodeलृ

examples

Source: SanskritDictionary.com. Do search with wildcard, like *लृ

Other reference: Monier Williams 1872 Dictionary.

Other reference: Sanskrit Heritage Site.

लृट् (in gram.) Name of the terminations of the Second Future or Name of that Tense itself.

Note that these entries have been altered from their sources to the encoding I think to be correct.

अनवकॢप्तिः anavaklṛptiḥ f. Impossibility, improbability, incredibility
अनुकॢप् anuklṛp 1 A. To follow duly. -Caus. To cause others to follow duly.
कॢप् klṛp 1 To be fit or adequate for result in, bring about, accomplish, produce, tend to;
कॢ lṛ ind. 1 The earth. -2 A mountain. -3 The mother of the gods. -4 The female nature. -5 A mystical letter.
परिकॢप् pariklṛp 1 Ā. 1 To tend to. -2 To give, grant, vouchsafe;
संकॢप् saṃklṛp 1 Ā. To wish or long for. -Caus. 1 To resolve, determine, settle. -2 To intend, aim at, purpose;
उपकॢप् upaklṛp 1 Ā. 1 To be fit for;
विकॢप् viklṛp 1 Ā. 1 To doubt, be doubtful;

क्लृप्त 1. Made, formed. 2. Fixed, appointed. 3. Ascertained, determined. 4. Cut, pared, shorn.

निरूह nir-ruha
निरृ nir-ri
निरृछ् nir-rich
निरृज् nir-rij
निरे nir-e

निरृथ nirṛtha m. destruction निरृतिः nirṛtiḥ f. death, destruction

नैरुज्य nair-rug-ya
नैरृत nair-rich
नैर्गन्ध्य nair-ghandh-ya

Monier-Williams p871 entries lūha lṛin lṛiṭ leka Not easily distinguished from vowel lṛi. But then in their font, the la doesn’t have a vertical stem anyway.