Actually, we have a project that uses a fatherboard, but as you might guess, it came after the motherboard in the design (ran out of space and then the fatherboard design idea made sense in terms of signal flow). I think they might call the boards in between daughterboards (probably just call them by their functional names), but have yet to see a sonboard. Another project does use grand-daughterboards, as you might guess, they go onto the daughterboard. [Gets weird when we reuse those grand-daughterboards on a different project where there is no daughterboard used.] I've never seen a mother-in-law board but I'm pretty sure many a board has been affectionately called the same endearing terms that most MIL's get... Shawn Upton, KB1CKT Test Engineer Allegro MicroSystems, LLC [log in to unmask] 603.626.2429/fax: 603.641.5336 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord Sent: Friday, September 20, 2013 1:35 AM To: [log in to unmask] Subject: [TN] Friday NTC: Hi all, time for a very serious question: whole my life I have , as well as rest of world, used the name 'motherboard'. For fulfilling natures rule of balance and harmony, there must be a 'fatherboard', but I have never seen it. Have you hold such a board in your hands? Inge ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________